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Knock sound from rear

Discussion in '1st Gen. Tacomas (1995-2004)' started by Akruspe, Mar 30, 2020.

  1. Mar 30, 2020 at 1:33 PM
    #1
    Akruspe

    Akruspe [OP] Well-Known Member

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    I have an 02 tacoma pre runner crew cab 2 wheel drive with the e locker. Bought it from my uncle its been sitting for a year or so had the rear diff leaking from the cover typical problem but was makin no noises when parked and hasnt been driven. Now i got the truck from him and its is making a knocking sound sounding like its coming from the diff. But when driving i can feel it through the floor at my feet. Cant seem to figure out what it could be. Im not a mechanic by any means but am somewhat inclined in it. The sound only happens when i accelerate and get up to speed it kind of drowns out also occurs on decelerating.
     
  2. Mar 30, 2020 at 1:38 PM
    #2
    jake72

    jake72 Well-Known Member

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    Maybe universal joint
     
  3. Mar 30, 2020 at 1:51 PM
    #3
    CrippledOldMan

    CrippledOldMan Well-Known Member

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    I'd get under it and grab the drive shaft and see if you can make any of the universal joints clink or have any play in them. I'd change the title of your thread from help, to something like drive trains issues. Help is usually reserved for someone that's broken down somewhere and needs "help".
     
  4. Mar 30, 2020 at 1:54 PM
    #4
    Akruspe

    Akruspe [OP] Well-Known Member

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    Ok i will change it. And i have gotten under it and the driveshaft seems good, theres not an excessive amount of play or anything like that from what i can tell.
     
  5. Mar 30, 2020 at 1:57 PM
    #5
    jake72

    jake72 Well-Known Member

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    I hear guys complain of axel wrap I think it's called. Caused from weak leaf springs
     
  6. Mar 30, 2020 at 2:02 PM
    #6
    Akruspe

    Akruspe [OP] Well-Known Member

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    The sound it makes sounded alot like when brakes get warn uneven and scape at a certain point when the wheels spin and the back passenger side shoes were warn in a manner i thought for sure that was it. But me and my dad re did the rear brakes and its still making the sound.
     
  7. Mar 30, 2020 at 2:15 PM
    #7
    CrippledOldMan

    CrippledOldMan Well-Known Member

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    I'm going to assume that you checked the fluid level in the rear end.that's one of the first things you should check , and if it's been sitting for a long period of time, maybe change the rear diff oil. just a suggestion.
     
  8. Mar 30, 2020 at 2:20 PM
    #8
    Akruspe

    Akruspe [OP] Well-Known Member

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    Yes when i bought it it had been sitting for a year in my uncles driveway with a slow leak in the diff. So when i got there it was empty i filled it with fresh fluid and drove it about 20min. Home where its been sitting since so i can work on it and fix all the other stuff going on. Then i drained the fluid and cleaned the diff so i could jb weld the bottom of it where the pinhole leaks were. Then filled it again. But still has sound. Thinking about just pulling the 3rd member out to check the gears wednesday just to see if a tooth is broken or something.
     
  9. Mar 30, 2020 at 7:23 PM
    #9
    TacomaEli

    TacomaEli Well-Known Member

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  10. Mar 30, 2020 at 7:56 PM
    #10
    Tacoma1997White4x4

    Tacoma1997White4x4 America First

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    Your uncle sounds like a crook
     
  11. Mar 30, 2020 at 8:10 PM
    #11
    Akruspe

    Akruspe [OP] Well-Known Member

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    Hed have had to sell it to me for a bunch of money and not tell me there were things wrong with it to be a crook. He informed me of all the things wrong as well as gave me all the recipts for all the work that has been done to it by toyota.
     
  12. Mar 30, 2020 at 8:26 PM
    #12
    Akruspe

    Akruspe [OP] Well-Known Member

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    The sound is consistent though as i speed up and slow down the sound never really goes away. I thought maybe driveshaft at first also but everything feels good. Theres no excessive play or anything.
     
  13. Mar 31, 2020 at 9:59 PM
    #13
    Space Man Spiff

    Space Man Spiff Member

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    Keep digging around in the diff; if the leak was bad enough for the diff to be empty :)eek:yikes!) and the tacoma sat for a year --it could be the bearings have rusted (if the oil leaked out, moisture-laden air can get in). Broken teeth usually create a metal paste -- did anything like that come out when you flushed it?
     
  14. Mar 31, 2020 at 10:17 PM
    #14
    Akruspe

    Akruspe [OP] Well-Known Member

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    Yeah the leak was super slow but over a years time of sitting obviously it was empty by then. And no sludge but when i flushed it there were just metal flakes. No chunks or shards or anything crazy just super thin flakes.
     

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